
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */


#ifndef SampleCode_DEFINED
#define SampleCode_DEFINED

#include "SkColor.h"
#include "SkEvent.h"
#include "SkKey.h"
#include "SkView.h"
class SkOSMenu;
class GrContext;

class SampleCode
    {
    public:
        static bool KeyQ(const SkEvent&, SkKey* outKey);
        static bool CharQ(const SkEvent&, SkUnichar* outUni);

        static bool TitleQ(const SkEvent&);
        static void TitleR(SkEvent*, const char title[]);
        static bool RequestTitle(SkView* view, SkString* title);

        static bool PrefSizeQ(const SkEvent&);
        static void PrefSizeR(SkEvent*, SkScalar width, SkScalar height);

        static bool FastTextQ(const SkEvent&);

        static SkMSec GetAnimTime();
        static SkMSec GetAnimTimeDelta();
        static SkScalar GetAnimSecondsDelta();
        static SkScalar GetAnimScalar(SkScalar speedPerSec, SkScalar period = 0);

        static GrContext* GetGr();
    };

//////////////////////////////////////////////////////////////////////////////

// interface that constructs SkViews
class SkViewFactory : public SkRefCnt
    {
    public:
        virtual SkView* operator() () const = 0;
    };

typedef SkView* (*SkViewCreateFunc)();

// wraps SkViewCreateFunc in SkViewFactory interface
class SkFuncViewFactory : public SkViewFactory
    {
    public:
        SkFuncViewFactory(SkViewCreateFunc func);
        virtual SkView* operator() () const SK_OVERRIDE;

    private:
        SkViewCreateFunc fCreateFunc;
    };

namespace skiagm
{
class GM;
}

// factory function that creates a skiagm::GM
typedef skiagm::GM* (*GMFactoryFunc)(void*);

// Takes a GM factory function and implements the SkViewFactory interface
// by making the GM and wrapping it in a GMSampleView. GMSampleView bridges
// the SampleView interface to skiagm::GM.
class SkGMSampleViewFactory : public SkViewFactory
    {
    public:
        SkGMSampleViewFactory(GMFactoryFunc func);
        virtual SkView* operator() () const SK_OVERRIDE;
    private:
        GMFactoryFunc fFunc;
    };

class SkViewRegister : public SkRefCnt
    {
    public:
        explicit SkViewRegister(SkViewFactory*);
        explicit SkViewRegister(SkViewCreateFunc);
        explicit SkViewRegister(GMFactoryFunc);

        ~SkViewRegister()
            {
            fFact->unref();
            }

        static const SkViewRegister* Head()
            {
            return gHead;
            }

        SkViewRegister* next() const
            {
            return fChain;
            }
        const SkViewFactory*   factory() const
            {
            return fFact;
            }

    private:
        SkViewFactory*  fFact;
        SkViewRegister* fChain;

        static SkViewRegister* gHead;
    };

///////////////////////////////////////////////////////////////////////////////

class SampleView : public SkView
    {
    public:
        SampleView() : fBGColor(SK_ColorWHITE), fRepeatCount(1)
            {
            fUsePipe = false;
            }

        void setBGColor(SkColor color)
            {
            fBGColor = color;
            }

        static bool IsSampleView(SkView*);
        static bool SetRepeatDraw(SkView*, int count);
        static bool SetUsePipe(SkView*, bool);

        /**
         *  Call this to request menu items from a SampleView.
         *  Subclassing notes: A subclass of SampleView can overwrite this method
         *  to add new items of various types to the menu and change its title.
         *  The events attached to any new menu items must be handled in its onEvent
         *  method. See SkOSMenu.h for helper functions.
         */
        virtual void requestMenu(SkOSMenu* menu) {}

    protected:
        virtual void onDrawBackground(SkCanvas*);
        virtual void onDrawContent(SkCanvas*) = 0;

        // overrides
        virtual bool onEvent(const SkEvent& evt);
        virtual bool onQuery(SkEvent* evt);
        virtual void draw(SkCanvas*);
        virtual void onDraw(SkCanvas*);

        bool fUsePipe;
        SkColor fBGColor;

    private:
        int fRepeatCount;

        typedef SkView INHERITED;
    };

#endif

